Noise reduction type generator set based on air duct optimization and structural sound insulation

Abstract

The noise reduction type generator set based on air duct optimization and structural sound insulation comprises a protective shell, a generator and a fan are arranged in the protective shell, and an air inlet air duct structure and an exhaust structure are arranged on the two sides of the protective shell correspondingly; the air inlet duct structure comprises a first air inlet groove and a second air inlet groove which are symmetrically formed in the side face of the protective shell, a first air guide cover and a second air guide cover are arranged on the portions, located on the outer sides of the first air inlet groove and the second air inlet groove, of the side face of the protective shell, and an air inlet cover is arranged between the first air guide cover and the second air guide cover. Ventilation grooves are formed in the opposite faces of the first air guide cover and the second air guide cover, first air inlets are formed in the two sides of the bottom side of the air inlet cover, and a third air guide cover is arranged on the side face of the protective shell and located on the inner sides of the first air inlet groove and the second air inlet groove. While efficient air inlet and heat dissipation of the generator set are guaranteed, the noise transmission path is effectively prolonged, pneumatic and structural noise is reduced, and the remarkable overall noise reduction effect is achieved.

Description

Technical Field

[0001] This invention belongs to the field of noise reduction generator technology, specifically relating to a noise reduction generator set based on duct optimization and structural sound insulation. Background Technology

[0002] Generator sets, as important independent power supply equipment, are widely used in field operations, emergency power supply, construction, communication support, camping, and catering vehicles. During operation, the internal combustion engine and its associated generator and cooling fan continuously generate significant mechanical and aerodynamic noise, especially in small and medium power generator sets, where noise problems are particularly prominent and can easily interfere with the surrounding environment and users, making it difficult to meet increasingly stringent environmental protection and low-noise requirements.

[0003] Existing noise-reducing generator sets typically reduce noise leakage by installing protective casings, sound-absorbing cotton, or sound insulation panels on the outside of the generator. However, since generator sets require a large amount of air for combustion and heat dissipation during operation, air inlets and outlets must be installed on the casing, inevitably creating noise transmission channels. Especially during the air intake process, high-speed airflow in narrow or poorly structured air ducts can easily generate eddies, impacts, and resonances, which not only reduce heat dissipation efficiency but also create significant aerodynamic noise, affecting the overall noise reduction effect.

[0004] In addition, the air intake structure of existing generator sets mostly adopts a single opening or a simple straight-through air duct design, with a single airflow direction and short path, resulting in limited noise attenuation distance and difficulty in meeting both ventilation and heat dissipation and noise reduction requirements. At the same time, the air intake is directly connected to the external environment, and noise can easily spread outward along the air duct, which greatly reduces the sound insulation effect of the protective shell.

[0005] Therefore, how to effectively extend the noise propagation path, reduce aerodynamic noise and structural sound transmission, and improve the overall stability and environmental adaptability of the generator set while ensuring the normal air intake and heat dissipation requirements of the generator set has become an urgent technical problem to be solved in the field of generator set noise reduction. This can be achieved by reasonably optimizing the air intake duct structure and combining it with multi-stage air guiding and sound insulation structures. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a noise-reducing generator set based on duct optimization and structural sound insulation, comprising a protective housing, inside which a generator and a fan are housed. An air intake duct structure and an exhaust structure are respectively provided on both sides of the protective housing. The air intake duct structure includes a first air intake slot and a second air intake slot symmetrically arranged on the side of the protective housing. A first air guide shroud and a second air guide shroud are provided on the side of the protective housing outside the first and second air intake slots. An air intake shroud is provided between the first and second air guide shrouds. A ventilation slot is provided on the opposite side of the first and second air guide shrouds. A first air inlet is provided on both sides of the bottom of the air intake shroud. A third air guide shroud is provided on the side of the protective housing inside the first and second air intake slots, and a second air inlet is provided on the surface of the third air guide shroud.

[0007] Preferably, a first baffle is vertically provided inside the air inlet hood, which divides the interior of the air inlet hood into a first air inlet area and a second air inlet area.

[0008] Preferably, the third air guide shroud is provided with a second baffle plate inside, and the second baffle plate is inclined.

[0009] Preferably, the protective housing has a third air inlet groove on its side inside the first air guide shroud, and the area of ​​the first air inlet area is larger than that of the second air inlet area.

[0010] Preferably, both the first and second air inlet slots are grid-shaped, formed by several strip slots arranged vertically.

[0011] Preferably, the second air inlet has a circular structure and is connected to a silencer pipe assembly. The silencer pipe assembly includes an inner guide pipe and an outer sleeve arranged concentrically along the axial direction. The inner guide pipe and the outer sleeve form a silencer cavity filled with a sound-absorbing medium. The inner guide pipe and the outer sleeve have several acoustic holes that communicate with the silencer cavity on their respective pipe walls.

[0012] Preferably, both the inner guide tube and the outer tube are corrugated tubes or spiral tubes.

[0013] Preferably, the exhaust structure includes multiple blades disposed on the side of the protective housing. The multiple blades are arranged side by side on the protective housing in a vertical direction. One end of each blade is rotatably connected to the protective housing through a hinge structure. A noise prevention device is provided at the contact point of two adjacent blades. The noise prevention device includes a first noise prevention member disposed at the end of the upper blade and a second noise prevention member disposed at the contact point of the lower blade. The first noise prevention member has a protrusion, and the second noise prevention member has a groove that mates with the protrusion.

[0014] Preferably, the outer surfaces of the first noise-prevention member and the second noise-prevention member are formed with slit structures, and the interiors of the first noise-prevention member and the second noise-prevention member are formed with hollow structures.

[0015] Preferably, the bottom of the protective housing is provided with a vibration damping plate, which is made of rubber.

[0016] The advantages of this invention are: 1. This solution, by setting up an air inlet shroud, air guide shroud, baffle plate and multi-stage air inlet channels, causes the outside air to undergo multiple changes in direction and reversals before entering the protective housing, guiding the airflow along a tortuous path, effectively disrupting the straight propagation of airflow, and reducing the aerodynamic noise generated by the high-speed airflow impacting the inner wall of the protective housing and the generator body.

[0017] 2. This solution uses a silencer assembly with an inner guide tube and an outer tube arranged concentrically, and fills the silencer cavity with a sound-absorbing medium. It also incorporates acoustic holes and a corrugated structure to allow sound waves to propagate along multiple paths and be absorbed or reflected and attenuated, achieving a silencing effect of direct airflow and bypass sound waves, and significantly reducing the noise of the air intake channel.

[0018] 3. The protective housing of this solution has exhaust blades on the side away from the air inlet. The blades can open and close automatically through a hinged structure. The blade ends are equipped with a noise prevention device with a convex-concave fit, which achieves a buffer fit during the blade closing process, effectively disperses the contact impact force, and reduces the mechanical noise generated at the moment of blade collision.

[0019] 4. In this design, longitudinal and transverse cuts are provided on the outer surface of the noise prevention component, and the hollow structure provides buffer elasticity, so that the airflow forms a flow around or vortex in the gap between the blades, which weakens the concentrated release of air kinetic energy, reduces the noise generated by the high-speed airflow impacting the air, and at the same time reduces the blade closing noise, thus achieving the synergistic suppression of aerodynamic and mechanical noise. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a structural diagram of the air intake hood of the present invention.

[0022] Figure 3 This is a structural diagram of the outer side of the protective housing of the present invention.

[0023] Figure 4 This is a structural diagram of the inner air inlet of the protective housing of the present invention.

[0024] Figure 5 This is a cross-sectional view of the present invention.

[0025] Figure 6 This is a schematic diagram of the silencer pipe assembly structure of the present invention.

[0026] Figure 7 This is a schematic diagram of the overall exhaust structure of the present invention.

[0027] Figure 8 This is an enlarged structural diagram of the blade of the present invention.

[0028] Figure 9 This is a structural diagram of the first noise prevention component of the present invention.

[0029] Figure 10 This is a structural diagram of the second noise prevention component of the present invention.

[0030] In the figure: 1 Protective shell, 2 First air inlet slot, 3 Second air inlet slot, 4 First air guide hood, 5 Second air guide hood, 6 Air inlet hood, 7 Ventilation slot, 8 First air inlet, 9 Third air guide hood, 10 Second air inlet, 11 First baffle plate, 12 Second baffle plate, 13 Third air inlet slot, 14 Silencer assembly, 15 Inner guide pipe, 16 Outer jacket, 17 Sound-absorbing medium, 18 Acoustic hole, 19 Blade, 20 First noise prevention component, 21 Second noise prevention component, 22 Cut-out structure, 23 Hollow structure, 24 Vibration damping plate. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Example 1, such as Figure 1-2 As shown, a noise-reducing generator set based on duct optimization and structural sound insulation includes a protective housing 1. An equipment mounting cavity is formed inside the protective housing 1. The generator body is fixedly installed in the central area of ​​the equipment mounting cavity and connected to the protective housing 1 via elastic vibration damping supports, thereby reducing the transmission of vibrations generated during generator operation to the housing structure. A fan assembly is located on one side of the generator body and connected to the generator output shaft or an independent drive mechanism to generate a stable and continuous airflow during generator operation, meeting the basic requirements for generator combustion and heat dissipation.

[0033] An air intake duct structure is provided on the air intake side wall of the protective housing 1. The air intake duct structure is used to introduce external air into the interior of the protective housing 1. Figure 3 A first air inlet slot 2 and a second air inlet slot 3 are symmetrically arranged on the left and right sides of the protective shell 1. The first air inlet slot 2 and the second air inlet slot 3 extend vertically and form a grid-like structure. This grid-like structure is composed of multiple vertically arranged strip slots with spacing between them to allow air to pass through smoothly while avoiding the formation of a straight sound propagation channel, thereby initially weakening the noise during the air entry stage.

[0034] Combination Figure 1A first air guide shroud 4 and a second air guide shroud 5 are respectively installed on the outer sides of the first air inlet slot 2 and the second air inlet slot 3. The first air guide shroud 4 and the second air guide shroud 5 are fixedly installed on the outer side of the protective housing 1, forming an air guide gap with the side wall of the protective housing 1. Before entering the protective housing 1, the outside air needs to enter the interior of the air guide shroud and undergo a change of direction inside the air guide shroud. Ventilation slots 7 are respectively formed on the opposite side surfaces of the first air guide shroud 4 and the second air guide shroud 5. The ventilation slots 7 extend vertically to introduce outside air into the interior space of the air guide shroud and to create a lateral flow path for the airflow upon entry.

[0035] An air inlet shroud 6 is installed between the first air guide shroud 4 and the second air guide shroud 5. The air inlet shroud 6 is a closed shroud structure and is fixedly connected to the outside of the protective shell 1. First air inlets 8 are respectively provided on both sides of the bottom of the air inlet shroud 6. The first air inlets 8 are connected to the internal space of the air guide shroud, allowing external air to enter the interior of the air inlet shroud 6 through the first air inlets 8 after passing through the air guide shroud. The first air inlets 8 are arranged in a horizontal direction, allowing external air to enter the interior space of the air inlet shroud 6 laterally. After entering the interior of the air inlet shroud 6 through the first air inlets 8, the airflow is guided inside the air inlet shroud 6 from horizontal flow to vertical flow. Specifically, a main flow channel is formed in the vertical direction inside the air inlet shroud 6, causing the airflow to flow upward under the constraint of gravity or the vertical structure, thus causing the first significant change in airflow direction. This longitudinal guidance process can disrupt the original vortex structure in the airflow, reduce the airflow velocity gradient, and help reduce the aerodynamic noise generated by the high-speed airflow impacting the inner wall of the shell.

[0036] Subsequently, after being guided inside the air inlet hood 6, the airflow changes from longitudinal to transverse flow again through the ventilation slots 7 located on the side of the air inlet hood 6, and enters the internal spaces of the first air guide hood 4 and the second air guide hood 5 respectively. Because the ventilation slots 7 are arranged transversely and there is a structural inflection point between the ventilation slots 7 and the interior of the air inlet hood 6, the airflow undergoes a second change of direction when passing through the ventilation slots 7, thereby further lengthening the noise propagation path and weakening the directional propagation characteristics of the sound waves.

[0037] After the airflow enters the first air guide shroud 4 and the second air guide shroud 5, it is deflected again by the arc or bend of the inner wall of the air guide shroud, causing the airflow to change from lateral flow to flow towards the inside of the protective shell 1, and finally enter the air intake duct structure inside the protective shell 1. This process constitutes a multi-stage deflection path for the airflow before entering the protective shell 1, causing the sound waves to be reflected, diffracted and attenuated multiple times during propagation, effectively suppressing the outward radiation of mid-to-high frequency noise along the air intake path.

[0038] By employing the multi-directional airflow guidance method described above, which involves transitioning from lateral air intake to longitudinal flow guidance, and then from lateral diversion to changing direction before entering the protective housing 1, airflow is guided through multiple non-linear flow paths with varying directions, ensuring sufficient intake volume. This effectively prevents noise from propagating in a straight line along the intake channel. This structure not only reduces the superposition effect of aerodynamic and mechanical noise but also significantly improves the overall intake noise reduction performance of the protective housing 1.

[0039] Combination Figure 2 A first baffle plate 11 is vertically arranged inside the air inlet hood 6, dividing the internal space of the air inlet hood 6 into a first air inlet area and a second air inlet area. The lateral area of ​​the first air inlet area is larger than that of the second air inlet area. External air can simultaneously enter the air inlet hood 6 from both sides of the first air inlet 8, creating a double-sided air inlet state with the airflow distributed to the left and right within the air inlet hood 6. When air enters the air inlet hood 6 through the two first air inlets 8, the airflow enters the corresponding side air inlet area and flows along the original entry direction. As the airflow continues to move forward, it encounters the vertically arranged first baffle plate 11. Under the obstruction and guidance of the first baffle plate 11, the airflow from both sides changes direction, changing from the original lateral entry direction to a longitudinal or oblique flow along the edge of the baffle plate, thereby avoiding direct airflow collision inside the air inlet hood 6.

[0040] After the airflow is guided by the first baffle plate 11, the airflow on the left and right sides is guided through the ventilation slots 7 set on the side of the air inlet hood 6, and enters the internal space of the first air guide hood 4 and the second air guide hood 5 respectively. Since the airflow has completed the direction adjustment and flow stabilization inside the air inlet hood 6 before entering the air guide hood, the airflow can enter the air guide hood in a relatively stable state, thereby reducing the aerodynamic noise generated by the high-speed airflow directly impacting the inner wall of the air guide hood and the structure of the protective shell 1.

[0041] Combination Figure 4A third air guide shroud 9 is installed on the side of the protective housing 1, inside the first air inlet slot 2 and the second air inlet slot 3. The third air guide shroud 9 is located inside the protective housing 1 and fixedly connected to the inner wall. The third air guide shroud 9 is used to guide the air that has already entered the housing. A second air inlet 10 is formed on the surface of the third air guide shroud 9. The second air inlet 10 is a circular structure and is connected to the silencer pipe assembly 14. The silencer pipe assembly 14 extends along the airflow direction and guides the airflow to the generator intake area. Since the third air guide shroud 9 is located inside the protective housing 1 and forms a relatively closed guiding space with the inner wall of the protective housing 1, the airflow undergoes secondary rectification before entering the generator intake area. This structure can effectively reduce the turbulence caused by the disordered diffusion of airflow inside the housing, and prevent high-speed airflow from directly impacting the inner wall of the protective housing 1 and the generator body, thereby reducing aerodynamic noise caused by airflow impact and pressure fluctuations. The second air inlet 10 is designed with a circular structure. The circular air inlet has a continuous circumferential structure without sharp corners, which facilitates uniform airflow convergence and reduces airflow separation and eddies at the inlet, thereby reducing local noise at the inlet. Simultaneously, the circular structure is less prone to directional reflection acoustically, helping to weaken the concentrated propagation of noise. The third air guide shroud 9 contains a second baffle plate 12, which is inclined.

[0042] The second baffle plate 12 is used to reguide the airflow that has entered the casing. When the airflow passes through the second baffle plate 12, the airflow direction is further changed from the original straight or tortuous flow. The flow path gradually extends and is smoothly dispersed along the inclined direction, so that the high-speed airflow no longer directly impacts the inner wall of the third air guide shroud 9 and the downstream structure. By setting the second baffle plate 12, the airflow completes secondary rectification and buffering before entering the second air inlet 10. The airflow velocity is effectively reduced when passing through the inclined guide surface, thereby reducing the generation of turbulence and local vortices. This buffering and flow direction adjustment effect can weaken the pressure fluctuations and aerodynamic noise formed when the airflow propagates inside the casing, while avoiding sudden impacts on the air before entering the silencer assembly 14, further improving the noise reduction effect.

[0043] Furthermore, the inclined second baffle 12 forces the airflow to distribute evenly along the oblique direction, reducing local high-speed noise caused by airflow concentrating in a single channel or corner, and extending the effective propagation path of the airflow from the air guide shroud to the second air inlet 10. This extended path not only increases the chance of noise attenuation but also disrupts the straight-line propagation of sound waves, causing the noise to be weakened in multiple stages before entering the generator intake area.

[0044] Combination Figure 5 and Figure 6The second air inlet 10 is connected to the silencer assembly 14, ensuring that the airflow entering the third air guide shroud 9 must pass through the silencer assembly 14 before entering the generator intake area. The silencer assembly 14 extends along the airflow direction, guiding noise axially during propagation within the duct, thereby increasing the sound wave propagation path length. This structure facilitates the reflection, diffraction, and gradual attenuation of noise during propagation.

[0045] In this embodiment, the silencer assembly 14 includes an inner guide pipe 15 and an outer casing 16 arranged concentrically along the axial direction. The inner guide pipe 15 serves as the main air intake channel for airflow, and the outer casing 16 and the inner guide pipe 15 form an annular silencer cavity, which is filled with a sound-absorbing medium 17. By separating the airflow channel from the silencer cavity, the airflow can pass smoothly while the noise it carries can be effectively guided into the silencer cavity for attenuation.

[0046] When airflow carrying noise passes through the inner guide pipe 15, the sound waves in the noise radiate outward through the acoustic holes 18 set on the wall of the inner guide pipe 15 and enter the silencing cavity formed between the outer outer pipe 16 and the inner guide pipe 15. The acoustic holes 18 create acoustic communication between the inner guide pipe 15 and the silencing cavity without affecting the main passage path of the airflow, thus achieving the silencing effect of "direct airflow and bypass sound waves". The sound waves entering the silencing cavity are converted into heat energy and gradually dissipated under the action of the sound-absorbing medium 17, thereby reducing the noise intensity.

[0047] Meanwhile, acoustic holes 18 are also provided on the wall of the outer tube 16, allowing sound waves in the anechoic cavity to undergo further reflection and attenuation between the outer tube 16 and the surrounding structure, preventing sound energy from forming standing waves or concentrated reflections in the anechoic cavity, thereby improving the overall sound absorption efficiency. The coordinated arrangement of the inner guide tube 15 and the acoustic holes 18 on both sides of the outer tube 16 significantly increases the probability of sound waves entering the anechoic cavity, improving the noise attenuation effect.

[0048] Furthermore, both the inner guide tube 15 and the outer tube 16 are designed with a corrugated structure. The corrugated shape creates a continuous undulating structure on the tube wall surface, thereby increasing the number of reflections and the propagation path length of the sound wave during propagation. For mid-to-low frequency noise, which has a longer wavelength and stronger penetrating power, traditional straight tube structures are difficult to attenuate effectively. However, the corrugated tube structure forces the sound wave to continuously change its propagation direction and generate multiple reflections during propagation, causing the sound energy to gradually attenuate, thus significantly improving the noise reduction effect on mid-to-low frequency noise.

[0049] The corrugated structure can also create an equivalently longer acoustic propagation path without significantly increasing the pipe length, allowing noise to undergo multiple reflections and absorptions within a limited space, which is beneficial for noise control design within the compact protective housing 1. At the same time, the corrugated structure has a certain rectification and buffering effect on airflow, which can reduce the secondary aerodynamic noise generated by high-speed airflow within the pipe.

[0050] Through the synergistic effect of the inner guide pipe 15, outer pipe 16, silencing cavity, sound-absorbing medium 17, acoustic hole 18 and corrugated pipe structure, the airflow can achieve multi-path absorption and reflection attenuation of airflow noise while ensuring air intake volume and flow stability. This effectively suppresses noise propagation outward along the air intake channel and significantly improves the overall noise reduction performance of the generator set.

[0051] Example 2 shares some similarities with Example 1. In this example, a third air inlet slot 13 is provided on the side of the protective housing 1 within the first air guide shroud 4. The third air inlet slot 13 has a circular structure, and the area of ​​the first air inlet region is larger than that of the second air inlet region. By adding this additional air inlet node, the third air inlet slot 13, to the air inlet path, the airflow undergoes at least one additional change in direction and channel conversion before entering the protective housing 1, structurally interrupting the straight-line propagation path of noise.

[0052] By setting an additional third air inlet slot 13 on the protective housing 1, a multi-stage guiding air intake path is achieved. Before entering the housing, outside air needs to pass through the air inlet hood 6, the first air intake area, and the third air inlet slot 13 in sequence, forming a tortuous multi-stage air intake channel. In order to ensure the smooth airflow within the multi-stage air intake structure and reduce the noise generated by high-speed airflow, the lateral cross-sectional area of ​​the first air intake area is set to be larger than the cross-sectional area of ​​the second air intake area and the third air inlet slot 13 in this embodiment. The larger cross-sectional area of ​​the first air intake area allows the airflow from both sides entering the air inlet hood 6 to be fully buffered and diffused within the first air intake area, the air velocity is relatively reduced, and the airflow from both sides or multiple directions converges in the large space without forming high-speed collisions or local vortices, thereby reducing the aerodynamic noise generated by the airflow impacting the wall of the air inlet hood 6 and adjacent structures. At the same time, the large cross-sectional area also increases the residence and rectification time of the airflow in the first air intake area, making the airflow more uniform and stable before entering the second air intake area and the third air inlet slot 13, further reducing the additional wind noise caused by uneven flow velocity or turbulence.

[0053] By designing the first air inlet area as a large cross-section area and combining it with the tortuous guidance of the third air inlet slot 13, the airflow needs to undergo multiple changes in direction and flow pattern adjustments before entering the casing. As noise propagates in different directions through the multi-stage channels, it is continuously dispersed and attenuated, and the straight propagation path is effectively disrupted, thereby further weakening noise transmission, especially with a significant effect on attenuating mid-to-high frequency wind noise.

[0054] Combination Figure 7 In this embodiment, an exhaust structure is provided on the side of the protective housing 1 away from the air inlet. The exhaust structure includes multiple exhaust blades 19, which are arranged side by side in a vertical direction. One end of each blade 19 is rotatably connected to the protective housing 1 via a hinge structure. During the arrangement of the blades 19, a noise prevention device is provided at the contact point of adjacent blades 19. The noise prevention device includes a first noise prevention member 20 provided at the end of the upper blade 19 and a second noise prevention member 21 provided at the contact point of the lower blade 19.

[0055] Combination Figure 8-10 The first noise-prevention component 20 has a protrusion, and the second noise-prevention component 21 has a groove that mates with the protrusion. The convex-concave structure achieves a buffer fit during the closing process of the blade 19. When the blade 19 closes due to its own weight or a drop in air pressure, the protrusion inserts into the groove, effectively dispersing the contact impact force and reducing the instantaneous noise generated by the collision at the tip of the blade 19.

[0056] Both the first noise-prevention component 20 and the second noise-prevention component 21 have longitudinal and transverse cuts on their outer surfaces. The cut structure 22 allows the blades 19 to deform and flow freely upon contact. The variable surface formed by the cuts disrupts the straight flow of air along the gaps between the blades 19, causing the airflow to disperse, circulate, or vortex at the gaps, thereby weakening the concentrated release of air kinetic energy and effectively reducing the noise generated by the high-speed airflow impacting the air. In addition, the first noise-prevention component 20 and the second noise-prevention component 21 have hollow structures 23 inside. The hollow structures 23 act as buffers and elastic deformations during the closing process of the blades 19, gradually releasing the contact impact and further reducing the closing noise of the blades 19. At the same time, the noise-prevention device can cooperate with the extended sealing part and the sealing groove to form an airtight seal, keeping the blades 19 in the closed state at a pressure lower than the set wind pressure, preventing air backflow, and ensuring that the airflow only flows in the predetermined direction, thereby reducing the additional noise generated by backflow or turbulence.

[0057] Through the above-mentioned convex-concave fit, hollow buffer, cut structure 22 and extended sealing design, the exhaust blade 19 can automatically open and close during operation, while significantly reducing the collision noise of the blade 19 and the air noise generated by the impact of high-speed airflow, thus achieving the function of low noise and smooth exhaust.

[0058] Embodiments of the present invention have been shown and described. It will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A noise-reducing generator set based on duct optimization and structural sound insulation, characterized in that: The protective housing (1) includes a generator and a fan inside. The protective housing (1) has an air intake duct structure and an exhaust structure on its two sides. The air intake duct structure includes a first air intake groove (2) and a second air intake groove (3) symmetrically arranged on the side of the protective housing (1). The protective housing (1) has a first air guide hood (4) and a second air guide hood (5) located outside the first air intake groove (2) and the second air intake groove (3) on its side. An air intake hood (6) is provided between the first air guide hood (4) and the second air guide hood (5). A ventilation groove (7) is opened on the opposite side of the first air guide hood (4) and the second air guide hood (5). The bottom side of the air intake hood (6) has a first air inlet (8) on both sides. The protective housing (1) has a third air guide hood (9) located inside the first air intake groove (2) and the second air intake groove (3) on its side. The surface of the third air guide hood (9) has a second air inlet (10).

2. The noise-reducing generator set based on duct optimization and structural sound insulation as described in claim 1, characterized in that: The air inlet hood (6) is vertically provided with a first baffle plate (11), which divides the interior of the air inlet hood (6) into a first air inlet area and a second air inlet area.

3. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 2, characterized in that: The third air guide shroud (9) is provided with a second baffle plate (12) inside, and the second baffle plate (12) is set at an angle.

4. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 3, characterized in that: The protective housing (1) has a third air inlet groove (13) located inside the first air guide shroud (4) on its side, and the area of ​​the first air inlet area is larger than that of the second air inlet area.

5. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 4, characterized in that: The first air inlet slot (2) and the second air inlet slot (3) are both grid-shaped and formed by several strip slots arranged vertically.

6. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 5, characterized in that: The second air inlet (10) has a circular structure and is connected to a silencer assembly (14). The silencer assembly (14) includes an inner guide pipe (15) and an outer sleeve (16) arranged concentrically along the axial direction. The inner guide pipe (15) and the outer sleeve (16) form a silencer cavity filled with a sound-absorbing medium (17). The inner guide pipe (15) and the outer sleeve (16) are respectively provided with a number of acoustic holes (18) that communicate with the silencer cavity.

7. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 6, characterized in that: Both the inner guide tube (15) and the outer tube (16) are corrugated tubes or spiral tubes.

8. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 7, characterized in that: The exhaust structure includes multiple blades (19) disposed on the side of the protective housing (1). The multiple blades (19) are arranged side by side in the vertical direction on the protective housing (1). One end of each blade (19) is rotatably connected to the protective housing (1) through a hinge structure. A noise prevention device is provided at the contact part of two adjacent blades (19). The noise prevention device includes a first noise prevention member (20) disposed at the end of the upper blade (19) and a second noise prevention member (21) disposed at the contact part of the lower blade (19). The first noise prevention member (20) has a protrusion, and the second noise prevention member (21) has a groove that cooperates with the protrusion.

9. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 8, characterized in that: The outer surfaces of the first noise-prevention member (20) and the second noise-prevention member (21) are formed with cutout structures (22), and the interiors of the first noise-prevention member (20) and the second noise-prevention member (21) are formed with hollow structures (23).

10. The noise-reducing generator set based on duct optimization and structural sound insulation according to claim 9, characterized in that: The bottom of the protective housing (1) is provided with a damping plate (24), which is made of rubber.

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